KYIV -- Ukrainian hackers claim to have broken into a second e-mail account linked to Vladislav Surkov, a senior aide to Russian President Vladimir Putin, releasing documents they say add to mounting evidence of the Kremlin meddling in Kyiv's affairs.

The new e-mails were obtained by RFE/RL from the hackers in advance of their public release on November 3. If authentic, they provide detail about the extent to which Surkov's office worked to set up separatist enclaves in eastern Ukraine in 2014.

The e-mails include plans that ostensibly show how associates of Surkov plotted to destabilize Ukraine’s eastern Kharkiv region, researched Ukrainian politicians who openly supported weakening central power in a bid to exploit the country’s political divisions, and helped establish the leadership of separatist groups in the Donetsk and Luhansk regions.

They indicate that, in one case, a draft law on an economic zone in eastern Ukraine purportedly written by Surkov himself was sent to the office of an opposition lawmaker and later introduced in the Ukrainian parliament.